8092907981 has 4 divisors (see below), whose sum is σ = 8245604412. Its totient is φ = 7940211552.

The previous prime is 8092907887. The next prime is 8092907989. The reversal of 8092907981 is 1897092908.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2025900100 + 6067007881 = 45010^2 + 77891^2 .

It is a cyclic number.

It is not a de Polignac number, because 8092907981 - 2³⁰ = 7019166157 is a prime.

It is a super-2 number, since 2×8092907981² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 152696377 = 8092907981 / (8 + 0 + 9 + 2 + 9 + 0 + 7 + 9 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8092907989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76348136 + ... + 76348241.

It is an arithmetic number, because the mean of its divisors is an integer number (2061401103).

Almost surely, 2^8092907981 is an apocalyptic number.

It is an amenable number.

8092907981 is a deficient number, since it is larger than the sum of its proper divisors (152696431).

8092907981 is a wasteful number, since it uses less digits than its factorization.

8092907981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152696430.

The product of its (nonzero) digits is 653184, while the sum is 53.

The square root of 8092907981 is about 89960.5912663984. The cubic root of 8092907981 is about 2007.7125517917.

The spelling of 8092907981 in words is "eight billion, ninety-two million, nine hundred seven thousand, nine hundred eighty-one".